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DRV8846: Operational at VREF between 0 to 1 V, but accuracy is degraded

Hirotaka Matsumoto
Guru 27585 points
Part Number: DRV8846

Hi all

Would you mind if we ask DRV8846?

There is the description "Operational at VREF between 0 to 1 V, but accuracy is degraded." on the datasheet P4.
According to VREF between 0 to 1 V, what is affeced for?
VREF is used for Ichop, so does VREF between 0 to 1 V degrade for current limitation?

Kind regards,

Hirotaka Matsumoto

  • 0
    TI__Guru** 114905 points
    Hi Matsumoto-san,

    Switching noise can affect current regulation at low VREF values.

    Please refer to Figure 6 of the datasheet. Current chopping is less accurate as the output of the sin dac decreases due to the indexer settings and torque modifiers.